Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3075957
Keywords
carbon nanotubes; filled polymers; infrared spectra; nanocomposites; photoconductivity; Schottky barriers
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Funding
- US NSF [ECCS 0748091, ECCS 0801924, DMR 0746449, DMR 0552295, DMI 0506531]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0748091] Funding Source: National Science Foundation
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We present a near IR photoresponse study of large area multiwalled carbon nanotube/poly(3-hexylthiophene)-block-polystyrene polymer (MWNT/P3HT-b-PS) nanocomposite films for different loading ratio of MWNT into the polymer matrix. We show that the photocurrent strongly depends on the position of the laser spot with maximum photocurrent occurring at the metal-film interface. In addition, compared to the pure MWNT film, the photoresponse is much larger in the MWNT/polymer composite films. The time constant for the photoresponse is slow and varies between 0.6 and 1.2 s. We explain the photoresponse by Schottky barrier modulation at the metal-film interface.
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